libserf: update to Serf 1.3.4

This update fixes the following issues with libserf:
- bnc#862983: update to Serf 1.3.4
This release fixes a race condition during OpenSSL initialisation and two ssl tunnel setup failures
* Endless loop during ssl tunnel setup with Negotiate authn
* Can't setup ssl tunnel which sends Connection close header
* race condition when initializing OpenSSL from multiple threads
* Incorrect pkg-config file when GSSAPI isn't configured
- also includes changes from 1.3.3
This is a small patch release containing a fix to solve a problem connecting to multi-homed servers (e.g. ipv4/ipv6) and some improvements in the use of error codes during ssl certificate validation and handling of timed out connections.
* Try more addresses of multihomed servers
* Handle X509_V_ERR_UNABLE_TO_VERIFY_LEAF_SIGNATURE correctly
* Return APR_TIMEUP from poll() to enable detecting connection timeouts

Fixed bugs
bnc#862983
serf 1.3.4 maintenance release fixes various network and ssl handling issues
Selected Binaries
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